3rd Rock from the Sun

The high commander of an alien expedition lands on Earth -- what he considers to be the least-important planet -- in human form as Dick Solomon. Along for the ride are his alien compatriots Harry, Sally and Tommy -- who is the eldest of the group but is now angrily trapped in a teen's body.

Synopsis from TMDB

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Cast

John Lithgow

Dick Solomon

Kristen Johnston

Sally Solomon

Jane Curtin

Mary Albright

Joseph Gordon-Levitt

Tommy Solomon

French Stewart

Harry Solomon

Simbi Khali

Nina Campbell

Wayne Knight

Don Orville

Elmarie Wendel

Mrs. Dubcek

Cast and crew data from TMDB